[jboss-jira] [JBoss JIRA] Created: (JBRULES-2223) ArrayIndexOutOfBoundsException in AbstractRuleBase.getStatefulSessions()

[Assen Todorov (JIRA)]

ArrayIndexOutOfBoundsException in AbstractRuleBase.getStatefulSessions()
------------------------------------------------------------------------

                 Key: JBRULES-2223
                 URL: https://jira.jboss.org/jira/browse/JBRULES-2223
             Project: JBoss Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
    Affects Versions: 4.0.7
            Reporter: Assen Todorov
            Assignee: Mark Proctor


The following exception is thrown on a multithreaded application, based on Terracotta & JBoss Drools (4.0.7).

{code}
java.lang.ArrayIndexOutOfBoundsException: 0
        at org.drools.util.ObjectHashSet.toArray(ObjectHashSet.java:152)
        at org.drools.common.AbstractRuleBase.getStatefulSessions(AbstractRuleBase.java:724)
        .......
{code}

The code :

{code}
   /**
    * Creates a new rule base if necesarry.
    * @param aRuleSet the rule set for the new rule base.
    * @throws RuleConversionException if the rule engine has a problem with rule set compilation and loading.
    */
   private void createRuleBase(final RuleSet aRuleSet) throws RuleConversionException
   {
      Check.notNull(aRuleSet, "aRuleSet");
      final String code = aRuleSet.getCode();
      Check.notNull(code, "aRuleSet.getCode()");
      Check.notEmpty(code, "aRuleSet.getCode()");

      final ECRC ecrc = new ECRC();
      ecrc.update(code);
      final long crc = ecrc.getValue();

      synchronized(ruleBaseCache)
      {
         ruleBase = ruleBaseCache.get(crc);
         if(ruleBase == null)
         {
            ruleBase = loadRuleBaseFromCode(code);
            ruleBaseCache.put(crc, ruleBase);
         }
         else {
            // rulebase already exist
            final StatefulSession[] sessions = ruleBase.getStatefulSessions();
            if(sessions.length > 0) {
               // old sessions (working memories exist)
               for(StatefulSession session: sessions) {
                  // clear the working memory
                  session.dispose();
               }
            }
         }
      }
   }
{code}

The class where this method is defined, is declared as _instrumented-classes_  in the Terracotta configuration.

Hope this helps !

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